http://www.sciencedirect.com/  
  http://www.plosone.org/  
  http://www.plosbiology.org/  
  http://www.plosgenetics.org/  
  http://www.ncbi.nlm.nih.gov/  
  http://www.ncbi.nlm.nih.gov/blast/Blast.cgi  
  http://www.ebi.ac.uk/  
  http://www.ebi.ac.uk/Tools/clustalw2/  
  http://www.justbio.com/  
  http://biotools.umassmed.edu/cgi-bin/primer3plus/primer3plus.cgi/  
  http://eu.idtdna.com/analyzer/Applications/OligoAnalyzer/  
  http://bibiserv.techfak.uni-bielefeld.de/  
  http://pathogene.swmed.edu/  
  http://www.megasoftware.net/  
  http://www.acaclone.com/